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Inter‐laboratory Characterisation of Apatite Reference Materials for Oxygen Isotope Analysis and Associated Methodological Considerations
Author(s) -
Wudarska Alicja,
Wiedenbeck Michael,
Słaby Ewa,
LempartDrozd Małgorzata,
Harris Chris,
Joachimski Michael M.,
Lécuyer Christophe,
MacLeod Kenneth G.,
Pack Andreas,
Vennemann Torsten,
Couffignal Frédéric,
Feng Dingsu,
Glodny Johannes,
Kusebauch Christof,
Mayanna Sathish,
Rocholl Alexander,
Speir Laura,
Sun Yadong,
Wilke Franziska D. H.
Publication year - 2022
Publication title -
geostandards and geoanalytical research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.037
H-Index - 73
eISSN - 1751-908X
pISSN - 1639-4488
DOI - 10.1111/ggr.12416
Subject(s) - apatite , fluorapatite , analytical chemistry (journal) , mass spectrometry , isotopes of oxygen , chemistry , secondary ion mass spectrometry , hydroxylapatite , mineralogy , isotope , environmental chemistry , nuclear chemistry , chromatography , biochemistry , physics , quantum mechanics , enzyme
Here we report on the oxygen isotope compositions of four proposed apatite reference materials (chlorapatite MGMH#133648 and fluorapatite specimens MGMH#128441A, MZ‐TH and ES‐MM). The samples were initially screened for 18 O/ 16 O homogeneity using secondary ion mass spectrometry (SIMS) followed by δ 18 O determinations in six gas source isotope ratio mass spectrometry laboratories (GS‐IRMS) using a variety of analytical protocols for determining either phosphate‐bonded or “bulk” oxygen compositions. We also report preliminary δ 17 O and Δ ’ 17 O data, major and trace element compositions collected using EPMA, as well as CO 3 2− and OH − contents in the apatite structure assessed using thermogravimetric analysis and infrared spectroscopy. The repeatability of our SIMS measurements was better than ± 0.25 ‰ (1 s ) for all four materials that cover a wide range of 10 3 δ 18 O values between +5.8 and +21.7. The GS‐IRMS results show, however, a significant offset of 10 3 δ 18 O values between the “phosphate” and “bulk” analyses that could not be correlated with chemical characteristics of the studied samples. Therefore, we provide two sets of working values specific to these two classes of analytical methodologies as well as current working values for SIMS data calibration.